US20250189770A1 - Zoom optical system, optical apparatus and method for manufacturing the zoom optical system - Google Patents

Zoom optical system, optical apparatus and method for manufacturing the zoom optical system Download PDF

Info

Publication number
US20250189770A1
US20250189770A1 US18/288,808 US202218288808A US2025189770A1 US 20250189770 A1 US20250189770 A1 US 20250189770A1 US 202218288808 A US202218288808 A US 202218288808A US 2025189770 A1 US2025189770 A1 US 2025189770A1
Authority
US
United States
Prior art keywords
lens group
optical system
zoom optical
group
lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/288,808
Other languages
English (en)
Inventor
Tomoyuki Sashima
Norikazu Yokoi
Takahiro Ishikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Assigned to NIKON CORPORATION reassignment NIKON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SASHIMA, Tomoyuki, YOKOI, NORIKAZU, ISHIKAWA, TAKAHIRO
Publication of US20250189770A1 publication Critical patent/US20250189770A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+--
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-++-
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Definitions

  • the present invention relates to a zoom optical system, an optical apparatus, and a method for manufacturing the zoom optical system.
  • a zoom optical system which is suitable for a photographic camera, an electronic still camera, a video camera, or the like (for example, see Patent Literature 1).
  • a zoom optical system it is difficult to obtain excellent optical performance while realizing size reduction and weight reduction.
  • a zoom optical system comprises: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having negative refractive power, the first, second, third, fourth, and fifth lens groups being aligned in order from an object side along an optical axis, in which when zooming is performed, intervals between neighboring lens groups are changed, the fourth lens group is a focusing lens group which moves along the optical axis when focusing is performed, and the following conditional expression is satisfied,
  • f4 denotes a focal length of the fourth lens group
  • f5 denotes a focal length of the fifth lens group.
  • a zoom optical system consists of: a first lens group having positive refractive power; a second lens group having negative refractive power; an intermediate group which has at least one lens group and which has positive refractive power; a focusing lens group having negative refractive power; and a rear group having at least one lens group, the first lens group, the second lens group, the intermediate group, the focusing lens group, and the rear group being aligned in order from an object side along an optical axis, in which when zooming is performed, intervals between neighboring lens groups are changed, the focusing lens group moves along the optical axis when focusing is performed, and the following conditional expressions are satisfied,
  • f2 denotes a focal length of the second lens group
  • Bfw denotes a back focal length of the zoom optical system in a wide angle end state
  • fw denotes a focal length of the zoom optical system in the wide angle end state.
  • An optical apparatus includes the zoom optical system.
  • the zoom optical system comprises a first lens group having positive refractive power; a second lens group having negative refractive power, a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having negative refractive power, which are aligned in order from an object side along an optical axis.
  • the method comprises a step of arranging the lens groups in a lens barrel so that:
  • the fourth lens group is a focusing lens group which moves along the optical axis when focusing is performed.
  • f4 denotes a focal length of the fourth lens group
  • f5 denotes a focal length of the fifth lens group.
  • FIG. 1 is a diagram illustrating a lens configuration of a zoom optical system according to a first example
  • FIG. 2 A and FIG. 2 B are diagrams of various aberrations of the zoom optical system according to the first example upon focusing on infinity respectively in a wide angle end state and a telephoto end state;
  • FIG. 3 is a diagram illustrating a lens configuration of a zoom optical system according to a second example
  • FIG. 4 A and FIG. 4 B are diagrams of various aberrations of the zoom optical system according to the second example upon focusing on infinity respectively in the wide angle end state and the telephoto end state;
  • FIG. 5 is a diagram illustrating a lens configuration of a zoom optical system according to a third example
  • FIG. 6 A and FIG. 6 B are diagrams of various aberrations of the zoom optical system according to the third example upon focusing on infinity respectively in the wide angle end state and the telephoto end state;
  • FIG. 7 is a diagram illustrating a lens configuration of a zoom optical system according to a fourth example.
  • FIG. 8 A and FIG. 8 B are diagrams of various aberrations of the zoom optical system according to the fourth example upon focusing on infinity respectively in the wide angle end state and the telephoto end state;
  • FIG. 9 is a diagram illustrating a configuration of a camera which includes a zoom optical system according to each embodiment.
  • FIG. 10 is a flowchart illustrating a method for manufacturing a zoom optical system according to a first embodiment
  • FIG. 11 is a flowchart illustrating a method for manufacturing a zoom optical system according to a second embodiment.
  • this camera 1 includes a main body 2 and a photographing lens 3 to be mounted on the main body 2 .
  • the main body 2 includes an image-capturing element 4 , a main-body control part (not illustrated) which controls actions of a digital camera, and a liquid crystal screen 5 .
  • the photographing lens 3 includes a zoom optical system ZL which is formed with a plurality of lens groups and a lens position control mechanism (not illustrated) which controls a position of each of the lens groups.
  • the lens position control mechanism includes a sensor which detects the position of the lens group, a motor which moves the lens group forward and rearward along an optical axis, a control circuit which drives the motor, and so forth.
  • Light from a photographed object is collected by the zoom optical system ZL of the photographing lens 3 and reaches an image surface I of the image-capturing element 4 .
  • Light from the photographed object which reaches the image surface I is subjected to photoelectric conversion by the image-capturing element 4 , and is recorded as digital image data in a memory which is not illustrated.
  • the digital image data recorded in the memory are capable of being displayed on the liquid crystal screen 5 in accordance with an operation by a user.
  • this camera may be a mirrorless camera or a single-lens reflex camera having an instant return mirror.
  • the zoom optical system ZL illustrated in FIG. 9 schematically illustrates the zoom optical system which is included in the photographing lens 3 , but a lens configuration of the zoom optical system ZL is not limited to this configuration.
  • a zoom optical system ZL( 1 ) as one example of the zoom optical system (zoom lens) ZL according to the first embodiment is configured to have a first lens group G 1 having positive refractive power, a second lens group G 2 having negative refractive power, a third lens group G 3 having positive refractive power, a fourth lens group G 4 having negative refractive power, and a fifth lens group G 5 having negative refractive power, which are aligned in order from an object side along an optical axis.
  • the fourth lens group G 4 is a focusing lens group GF which moves along the optical axis when focusing is performed.
  • the zoom optical system ZL according to the first embodiment satisfies the following conditional expression (1).
  • f4 denotes a focal length of the fourth lens group G 4 .
  • f5 denotes a focal length of the fifth lens group G 5 .
  • the zoom optical system ZL according to the first embodiment may be a zoom optical system ZL( 2 ) illustrated in FIG. 3 or may be a zoom optical system ZL( 3 ) illustrated in FIG. 5 .
  • the conditional expression (1) defines an appropriate relationship between the focal length of the fourth lens group G 4 and the focal length of the fifth lens group G 5 .
  • a spherical aberration, a coma aberration, and field curves can properly be corrected.
  • the focal length of the fourth lens group G 4 becomes long, a movement amount of the fourth lens group G 4 as the focusing lens group in focusing thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when focusing is performed. Further, the focal length of the fifth lens group G 5 becomes short, and it thereby becomes difficult to correct the field curves which occur in the fifth lens group G 5 .
  • the upper limit value of the conditional expression (1) is set to 0.65 or further 0.60, and effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the fourth lens group G 4 becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the fourth lens group G 4 . Further, the focal length of the fifth lens group G 5 becomes long, correction effect for the field curves by the fifth lens group G 5 thereby become low, and it becomes difficult to obtain excellent optical performance.
  • the lower limit value of the conditional expression (1) is set to 0.15 or further 0.20, and the effects of the present embodiment can thereby more certainly be obtained.
  • f3 denotes a focal length of the third lens group G 3 .
  • the conditional expression (2) defines an appropriate relationship between the focal length of the fourth lens group G 4 and the focal length of the third lens group G 3 .
  • the focal length of the fourth lens group G 4 becomes long, the movement amount of the fourth lens group G 4 as the focusing lens group in focusing thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when focusing is performed. Further, the focal length of the third lens group G 3 becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the third lens group G 3 .
  • the upper limit value of the conditional expression (2) is set to 4.50, 4.20, 3.90, 3.50, 3.00, 2.75, 2.50, or further 2.30, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the fourth lens group G 4 becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the fourth lens group G 4 . Further, the focal length of the third lens group G 3 becomes long, a movement amount of the third lens group G 3 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed.
  • the lower limit value of the conditional expression (2) is set to 0.05, 1.00, 1.25, or further 1.50, and the effects of the present embodiment can thereby more certainly be obtained.
  • zoom optical system ZL according to the first embodiment satisfy the following conditional expression (3).
  • f3 denotes the focal length of the third lens group G 3 .
  • the conditional expression (3) defines an appropriate relationship between the focal length of the third lens group G 3 and the focal length of the fifth lens group G 5 .
  • the focal length of the third lens group G 3 becomes long, the movement amount of the third lens group G 3 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed. Further, the focal length of the fifth lens group G 5 becomes short, and it thereby becomes difficult to correct the field curves which occur in the fifth lens group G 5 .
  • the upper limit value of the conditional expression (3) is set to 0.75, 0.50, 0.29, or further 0.25, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the third lens group G 3 becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the third lens group G 3 . Further, the focal length of the fifth lens group G 5 becomes long, the correction effect for the field curves by the fifth lens group G 5 thereby become low, and it becomes difficult to obtain excellent optical performance.
  • the lower limit value of the conditional expression (3) is set to 0.05 or further 0.09, and the effects of the present embodiment can thereby more certainly be obtained.
  • the zoom optical system ZL according to the first embodiment satisfy the following conditional expression (4).
  • f3 denotes the focal length of the third lens group G 3 .
  • f45t denotes a combined focal length of the fourth lens group G 4 and the fifth lens group G 5 in the telephoto end state.
  • the conditional expression (4) defines an appropriate relationship between the focal length of the third lens group G 3 and the combined focal length of the fourth lens group G 4 and the fifth lens group G 5 in the telephoto end state.
  • the focal length of the third lens group G 3 becomes long, the movement amount of the third lens group G 3 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed. Further, the combined focal length of the fourth lens group G 4 and the fifth lens group G 5 in the telephoto end state becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the fourth lens group G 4 and the fifth lens group G 5 .
  • the upper limit value of the conditional expression (4) is set to 1.75, 1.50, 1.25, 0.90, or further 0.76, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the third lens group G 3 becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the third lens group G 3 .
  • the combined focal length of the fourth lens group G 4 and the fifth lens group G 5 in the telephoto end state becomes long, movement amounts of the fourth lens group G 4 and the fifth lens group G 5 in zooming thereby become large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when zooming is performed.
  • the lower limit value of the conditional expression (4) is set to 0.10, 0.25, 0.33, 0.45, or further 0.56, and the effects of the present embodiment can thereby more certainly be obtained.
  • ⁇ 5 t denotes a lateral magnification of the fifth lens group G 5 in the telephoto end state.
  • ⁇ 5 w denotes the lateral magnification of the fifth lens group G 5 in the wide angle end state.
  • the conditional expression (5) defines an appropriate relationship between the lateral magnification of the fifth lens group G 5 in the telephoto end state and the lateral magnification of the fifth lens group G 5 in the wide angle end state. It is preferable that the conditional expression (5) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • An upper limit value of the conditional expression (5) is set to 1.80, 1.65, 1.55, 1.49, or further 1.30, and the effects of the present embodiment can thereby more certainly be obtained.
  • a lower limit value of the conditional expression (5) is set to 0.10, 0.25, 0.50, 0.75, 0.90, or further 1.07, and the effects of the present embodiment can thereby more certainly be obtained.
  • Bfw denotes a back focal length of the zoom optical system ZL in the wide angle end state
  • fw denotes a focal length of the zoom optical system ZL in the wide angle end state.
  • the conditional expression (6) defines an appropriate relationship between the back focal length of the zoom optical system ZL in the wide angle end state and the focal length of the zoom optical system ZL in the wide angle end state. Note that in each of the embodiments, it is assumed that the back focal length of the zoom optical system ZL is an air equivalent distance on the optical axis from a lens surface on a side of the zoom optical system ZL, the side being closest to the image surface, to the image surface I. It is preferable that the conditional expression (6) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • An upper limit value of the conditional expression (6) is set to 0.90, 0.85, 0.80, 0.78, 0.75, 0.65, or further 0.58, and the effects of the present embodiment can thereby more certainly be obtained.
  • a lower limit value of the conditional expression (6) is set to 0.10, 0.30, 0.40, or further 0.50, and the effects of the present embodiment can thereby more certainly be obtained.
  • the zoom optical system ZL it is desirable that the fifth lens group G 5 consist of two lenses. Accordingly, fluctuations in the field curves when zooming is performed can properly be suppressed.
  • the third lens group G 3 have a lens which satisfies the following conditional expression (7).
  • ⁇ 3 L denotes an Abbe number of the lens in the third lens group G 3 .
  • the conditional expression (7) defines an appropriate range of the Abbe number of the lens in the third lens group G 3 . Because when the third lens group G 3 has the lens which satisfies the conditional expression (7), a zoom optical system can be obtained in which a chromatic aberration is corrected and which provides excellent optical performance, such a zoom optical system is preferable.
  • a lower limit value of the conditional expression (7) is set to 77.00, 80.00, or further 82.00, and the effects of the present embodiment can thereby more certainly be obtained.
  • the zoom optical system ZL it is desirable that the third lens group G 3 have, in a part of the third lens group G 3 , a vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis. Accordingly, because a zoom optical system can be obtained which provides proper vibration proof performance while realizing size reduction and weight reduction, such a zoom optical system is preferable.
  • the zoom optical system ZL according to the first embodiment satisfy the following conditional expression (8).
  • f3 denotes the focal length of the third lens group G 3 .
  • fVR denotes a focal length of the vibration proof group GVR.
  • the conditional expression (8) defines an appropriate relationship between the focal length of the third lens group G 3 and the focal length of the vibration proof group GVR.
  • the upper limit value of the conditional expression (8) is set to 1.75, 1.50, 1.25, or further 1.00, and the effects of the present embodiment can thereby more certainly be obtained.
  • the lower limit value of the conditional expression (8) is set to 0.10, 0.30, 0.40, or further 0.45, and the effects of the present embodiment can thereby more certainly be obtained.
  • the vibration proof group GVR be arranged on a side of the third lens group G 3 , the side being closest to the image surface. Accordingly, proper vibration proof performance can be obtained while the optical performance as the zoom optical system is maintained.
  • the zoom optical system ZL( 1 ) as one example of the zoom optical system (zoom lens) ZL according to the second embodiment consists of the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, an intermediate group GM which has at least one lens group and which has positive refractive power, a focusing lens group GF having negative refractive power, and a rear group GR having at least one lens group, which are aligned in order from the object side along the optical axis.
  • the focusing lens group GF moves along the optical axis when focusing is performed.
  • the zoom optical system ZL according to the second embodiment satisfies the following conditional expression (9) and the above-described conditional expression (6).
  • f2 denotes a focal length of the second lens group G 2 .
  • fMt denotes a focal length of the intermediate group GM in the telephoto end state
  • Bfw denotes the back focal length of the zoom optical system ZL in the wide angle end state
  • fw denotes the focal length of the zoom optical system ZL in the wide angle end state.
  • the zoom optical system ZL according to the second embodiment may be the zoom optical system ZL( 2 ) illustrated in FIG. 3 , may be the zoom optical system ZL( 3 ) illustrated in FIG. 5 , or a zoom optical system ZL( 4 ) illustrated in FIG. 7 .
  • conditional expression (9) defines an appropriate relationship between the focal length of the second lens group G 2 and the focal length of the intermediate group GM in the telephoto end state.
  • the focal length of the second lens group G 2 becomes long, a movement amount of the second lens group G 2 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when zooming is performed. Further, the focal length of the intermediate group GM in the telephoto end state becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the intermediate group GM.
  • the upper limit value of the conditional expression (9) is set to 0.75 or further 0.70, and effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the second lens group G 2 becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the second lens group G 2 .
  • the focal length of the intermediate group GM in the telephoto end state becomes long, a movement amount of the intermediate group GM in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed.
  • the lower limit value of the conditional expression (9) is set to 0.40 or further 0.50, and the effects of the present embodiment can thereby more certainly be obtained.
  • conditional expression (6) defines an appropriate relationship between the back focal length of the zoom optical system ZL in the wide angle end state and the focal length of the zoom optical system ZL in the wide angle end state. It is preferable that the conditional expression (6) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • the upper limit value of the conditional expression (6) is set to 0.90, 0.85, 0.80, 0.78, 0.75, 0.65, or further 0.58, and the effects of the present embodiment can thereby more certainly be obtained.
  • the lower limit value of the conditional expression (6) is set to 0.10, 0.30, 0.40, or further 0.50, and the effects of the present embodiment can thereby more certainly be obtained.
  • fF denotes a focal length of the focusing lens group GF.
  • conditional expression (10) defines an appropriate relationship between the focal length of the focusing lens group GF and the focal length of the intermediate group GM in the telephoto end state.
  • the focal length of the focusing lens group GF becomes long, a movement amount of the focusing lens group GF in focusing thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when focusing is performed. Further, the focal length of the intermediate group GM in the telephoto end state becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the intermediate group GM.
  • the upper limit value of the conditional expression (10) is set to 4.50, 4.00, 3.50, 3.00, or further 2.30, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the focusing lens group GF becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the focusing lens group GF. Further, the focal length of the intermediate group GM in the telephoto end state becomes long, the movement amount of the intermediate group GM in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed.
  • the lower limit value of the conditional expression (10) is set to 0.10, 0.50, 0.70, 1.00, 1.25, or further 1.50, and the effects of the present embodiment can thereby more certainly be obtained.
  • fRt denotes a focal length of the rear group GR in the telephoto end state.
  • the conditional expression (11) defines an appropriate relationship between the focal length of the intermediate group GM in the telephoto end state and the focal length of the rear group GR in the telephoto end state.
  • the focal length of the intermediate group GM in the telephoto end state becomes long, the movement amount of the intermediate group GM in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed. Further, the focal length of the rear group GR in the telephoto end state becomes short, and it thereby becomes difficult to correct the field curves which occur in the rear group GR.
  • the upper limit value of the conditional expression (11) is set to 0.85, 0.70, 0.60, 0.50, 0.35, or further 0.25, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the intermediate group GM in the telephoto end state becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the intermediate group GM. Further, the focal length of the rear group GR in the telephoto end state becomes long, the correction effect for the field curves by the rear group GR thereby become low, and it becomes difficult to obtain excellent optical performance.
  • the lower limit value of the conditional expression (11) is set to 0.03 or further 0.04, and the effects of the present embodiment can thereby more certainly be obtained.
  • fF denotes the focal length of the focusing lens group GF
  • fRt denotes the focal length of the rear group GR in the telephoto end state.
  • conditional expression (12) defines an appropriate relationship between the focal length of the focusing lens group GF and the focal length of the rear group GR in the telephoto end state.
  • the focal length of the focusing lens group GF becomes long, the movement amount of the focusing lens group GF in focusing thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when focusing is performed. Further, the focal length of the rear group GR in the telephoto end state becomes short, and it thereby becomes difficult to correct the field curves which occur in the rear group GR.
  • the upper limit value of the conditional expression (12) is set to 0.85, 0.75, 0.65, 0.60, or further 0.55, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the focusing lens group GF becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the focusing lens group GF. Further, the focal length of the rear group GR in the telephoto end state becomes long, the correction effect for the field curves by the rear group GR thereby become low, and it becomes difficult to obtain excellent optical performance.
  • the lower limit value of the conditional expression (12) is set to 0.06 or further 0.075, and the effects of the present embodiment can thereby more certainly be obtained.
  • fFRt denotes a combined focal length of the focusing lens group GF in the telephoto end state and at least one lens group of the rear group GR.
  • the conditional expression (13) defines an appropriate relationship between the focal length of the intermediate group GM in the telephoto end state and the combined focal length of the focusing lens group GF in the telephoto end state and at least one lens group of the rear group GR.
  • the focal length of the intermediate group GM in the telephoto end state becomes long, the movement amount of the intermediate group GM in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration and the coma aberration when zooming is performed. Further, the combined focal length of the focusing lens group GF in the telephoto end state and at least one lens group of the rear group GR becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in a lens group arranged on the image surface side relative to the intermediate group GM.
  • the upper limit value of the conditional expression (13) is set to 0.90 or further 0.80, and the effects of the present embodiment can thereby more certainly be obtained.
  • the focal length of the intermediate group GM in the telephoto end state becomes short, and it thereby becomes difficult to correct the spherical aberration and the coma aberration which occur in the intermediate group GM.
  • the combined focal length of the focusing lens group GF in the telephoto end state and at least one lens group of the rear group GR becomes long, a movement amount, in zooming, of the lens group arranged on the image surface side relative to the intermediate group GM becomes large, and it thereby becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, the field curves when zooming is performed.
  • the lower limit value of the conditional expression (13) is set to 0.10, 0.25, 0.35, or further 0.45, and the effects of the present embodiment can thereby more certainly be obtained.
  • ⁇ Rt denotes a lateral magnification of the rear group GR in the telephoto end state
  • ⁇ Rw denotes a lateral magnification of the rear group GR in the wide angle end state.
  • the conditional expression (14) defines an appropriate relationship between the lateral magnification of the rear group GR in the telephoto end state and the lateral magnification of the rear group GR in the wide angle end state. It is preferable that the conditional expression (14) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • An upper limit value of the conditional expression (14) is set to 1.80, 1.65, 1.50, 1.45, 1.35, or further 1.25, and the effects of the present embodiment can thereby more certainly be obtained.
  • a lower limit value of the conditional expression (14) is set to 0.10, 0.25, 0.40, 0.50, or further 0.70, and the effects of the present embodiment can thereby more certainly be obtained.
  • the rear group GR consist of two lenses. Accordingly, fluctuations in the field curves when zooming is performed can properly be suppressed.
  • the intermediate group GM consist of one lens group. Accordingly, because a zoom optical system can be obtained which provides excellent optical performance while realizing size reduction and weight reduction, such a zoom optical system is preferable.
  • the rear group GR consist of one lens group. Accordingly, because a zoom optical system can be obtained which provides excellent optical performance while realizing size reduction and weight reduction, such a zoom optical system is preferable.
  • the rear group GR have negative refractive power. Accordingly, because a zoom optical system can be obtained which provides excellent optical performance while realizing size reduction and weight reduction, such a zoom optical system is preferable.
  • the intermediate group GM have a lens which satisfies the following conditional expression (15).
  • ⁇ ML denotes an Abbe number of the lens in the intermediate group GM.
  • the conditional expression (15) defines an appropriate range of the Abbe number of the lens in the intermediate group GM. Because when the intermediate group GM has the lens which satisfies the conditional expression (15), a zoom optical system can be obtained in which a chromatic aberration is corrected and which provides excellent optical performance, such a zoom optical system is preferable.
  • a lower limit value of the conditional expression (15) is set to 76.00, 77.50, 78.50, or further 80.00, and the effects of the present embodiment can thereby more certainly be obtained.
  • the intermediate group GM have, in a part of the intermediate group GM, the vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis. Accordingly, because a zoom optical system can be obtained which provides proper vibration proof performance while realizing size reduction and weight reduction, such a zoom optical system is preferable.
  • fVR denotes the focal length of the vibration proof group GVR.
  • conditional expression (16) defines an appropriate relationship between the focal length of the intermediate group GM in the telephoto end state and the focal length of the vibration proof group GVR.
  • the upper limit value of the conditional expression (16) is set to 0.85 or further 0.75, and the effects of the present embodiment can thereby more certainly be obtained.
  • the lower limit value of the conditional expression (16) is set to 0.10, 0.25, 0.45, or further 0.60, and the effects of the present embodiment can thereby more certainly be obtained.
  • the vibration proof group GVR be arranged on a side of the intermediate group GM, the side being closest to the image surface. Accordingly, proper vibration proof performance can be obtained while the optical performance as the zoom optical system is maintained.
  • zoom optical system ZL according to the first embodiment and the second embodiment satisfy the following conditional expression (17).
  • fVR denotes the focal length of the vibration proof group GVR
  • fF denotes the focal length of the focusing lens group GF.
  • conditional expression (17) defines an appropriate relationship between the focal length of the vibration proof group GVR and the focal length of the focusing lens group GF.
  • the focal length of the vibration proof group GVR becomes long, the movement amount of the vibration proof group GVR in a case where the image blur is corrected thereby becomes large, and it becomes difficult to suppress the eccentric coma aberration and the asymmetrical field curves. Further, the focal length of the focusing lens group GF becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the focusing lens group GF.
  • the upper limit value of the conditional expression (17) is set to 2.00, 1.80, 1.65, or further 1.60, and the effects of each of the embodiments can thereby more certainly be obtained.
  • the focal length of the vibration proof group GVR becomes short, and it thereby becomes difficult to suppress the eccentric coma aberration and the asymmetrical field curves which occur in the vibration proof group GVR in a case where the image blur is corrected.
  • the focal length of the focusing lens group GF becomes long, the movement amount of the focusing lens group GF in focusing thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when focusing is performed.
  • the lower limit value of the conditional expression (17) is set to 0.10, 0.40, 0.63, 0.70, or further 1.00, and the effects of each of the embodiments can thereby more certainly be obtained.
  • the vibration proof group GVR consist of two lenses. Accordingly, fluctuations in the chromatic aberration in a case where the image blur is corrected can be suppressed.
  • zoom optical system ZL according to the first embodiment and the second embodiment satisfy the following conditional expression (18).
  • f1 denotes a focal length of the first lens group G 1
  • f2 denotes the focal length of the second lens group G 2 .
  • conditional expression (18) defines an appropriate relationship between the focal length of the second lens group G 2 and the focal length of the first lens group G 1 .
  • the focal length of the second lens group G 2 becomes long, the movement amount of the second lens group G 2 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when zooming is performed. Further, the focal length of the first lens group G 1 becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the first lens group G 1 .
  • the upper limit value of the conditional expression (18) is set to 0.75, 0.50, 0.30, 0.25, 0.20, or further 0.18, and the effects of each of the embodiments can thereby more certainly be obtained.
  • the focal length of the second lens group G 2 becomes short, and it thereby becomes difficult to correct the spherical aberration, the coma aberration, and the field curves which occur in the second lens group G 2 .
  • the focal length of the first lens group G 1 becomes long, a movement amount of the first lens group G 1 in zooming thereby becomes large, and it becomes difficult to suppress fluctuations in the spherical aberration, the coma aberration, and the field curves when zooming is performed.
  • the lower limit value of the conditional expression (18) is set to 0.05, 0.10, or further 0.16, and the effects of each of the embodiments can thereby more certainly be obtained.
  • zoom optical system ZL according to the first embodiment and the second embodiment satisfy the following conditional expression (19).
  • TLt denotes an entire length of the zoom optical system ZL in the telephoto end state
  • ft denotes the focal length of the zoom optical system ZL in the telephoto end state.
  • the conditional expression (19) defines an appropriate relationship between the entire length of the zoom optical system ZL in the telephoto end state and the focal length of the zoom optical system ZL in the telephoto end state. Note that in each of the embodiments, it is assumed that the entire length of the zoom optical system ZL is a distance on the optical axis from a lens surface on a side of the zoom optical system ZL, the side being closest to an object, to the image surface I (however, the distance on the optical axis from the lens surface on the side of the zoom optical system ZL, the side being closest to the image surface, to the image surface I is the air equivalent distance).
  • conditional expression (19) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • An upper limit value of the conditional expression (19) is set to 1.75, 1.50, 1.35, 1.20, or further 1.19, and the effects of each of the embodiments can thereby more certainly be obtained.
  • a lower limit value of the conditional expression (19) is set to 0.10, 0.50, or further 1.00, and the effects of each of the embodiments can thereby more certainly be obtained.
  • zoom optical system ZL according to the first embodiment and the second embodiment satisfy the following conditional expression (20).
  • ⁇ Ft denotes a lateral magnification of the focusing lens group GF in the telephoto end state
  • ⁇ Fw denotes the lateral magnification of the focusing lens group GF in the wide angle end state.
  • the conditional expression (20) defines an appropriate relationship between the lateral magnification of the focusing lens group GF in the telephoto end state and the lateral magnification of the focusing lens group GF in the wide angle end state. It is preferable that the conditional expression (20) is satisfied, by which a zoom optical system, which provides excellent optical performance while realizing size reduction and weight reduction, can be obtained.
  • An upper limit value of the conditional expression (20) is set to 1.80, 1.65, 1.50, or further 1.35, and the effects of each of the embodiments can thereby more certainly be obtained.
  • a lower limit value of the conditional expression (20) is set to 0.10, 0.50, 0.85, 0.90, 1.20, or further 1.21, and the effects of each of the embodiments can thereby more certainly be obtained.
  • the focusing lens group GF consist of two lenses. Accordingly, fluctuations in the chromatic aberration when focusing is performed can be suppressed.
  • the first lens group G 1 have a lens which satisfies the following conditional expression (21).
  • ⁇ 1 L denotes an Abbe number of the lens in the first lens group G 1 .
  • the conditional expression (21) defines an appropriate range of the Abbe number of the lens in the first lens group G 1 . Because when the first lens group G 1 has the lens which satisfies the conditional expression (21), a zoom optical system can be obtained in which the chromatic aberration is corrected and which provides excellent optical performance, such a zoom optical system is preferable.
  • a lower limit value of the conditional expression (21) is set to 76.00, 77.50, 78.50, or further 80.00, and the effects of the present embodiment can thereby more certainly be obtained.
  • step ST 1 in order from the object side along the optical axis, the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, the third lens group G 3 having positive refractive power, the fourth lens group G 4 having negative refractive power, and the fifth lens group G 5 having negative refractive power are arranged (step ST 1 ).
  • step ST 2 a configuration is made such that when zooming is performed, intervals between the neighboring lens groups are changed.
  • step ST 3 a configuration is made such that the fourth lens group G 4 becomes a focusing lens group which moves along the optical axis when focusing is performed.
  • each of the lenses is arranged in a lens barrel such that at least the above conditional expression (1) is satisfied (step ST 4 ).
  • the zoom optical system ZL according to the second embodiment will be outlined with reference to FIG. 11 .
  • the first lens group G 1 having positive refractive power
  • the second lens group G 2 having negative refractive power
  • the intermediate group GM which has at least one lens group and which has positive refractive power
  • the focusing lens group GF having negative refractive power
  • the rear group GR having at least one lens group
  • a configuration is made such that when zooming is performed, intervals between the neighboring lens groups are changed (step ST 12 ).
  • a configuration is made such that the focusing lens group GF moves along the optical axis when focusing is performed (step ST 13 ).
  • each of the lenses is arranged in a lens barrel such that at least the above conditional expression (9) and conditional expression (6) are satisfied (step ST 14 ).
  • a manufacturing method it becomes possible to manufacture a zoom optical system which provides excellent optical performance while realizing size reduction and weight reduction.
  • FIG. 1 , FIG. 3 , FIG. 5 , and FIG. 7 are cross-sectional views which respectively illustrate configurations and refractive power distributions of the zoom optical systems ZL ⁇ ZL( 1 ) to ZL( 4 ) ⁇ according to first to fourth examples.
  • the examples which correspond to the first embodiment are the first to third examples, and the examples which correspond to the second embodiment are the first to fourth examples.
  • a movement direction of each of the lens groups when zooming is performed from the wide angle end state (W) to the telephoto end state (T) is indicated by an arrow.
  • a movement direction of the focusing lens group when focusing is performed from infinity to a short-distance object is indicated by an arrow with characters of “FOCUSING”.
  • a movement direction of the vibration proof group in a case where the image blur is corrected is indicated by an arrow with characters of “VIBRATION PROOF”.
  • each of the lens groups is denoted by a combination of a reference character G and a numeral
  • each of the lenses is denoted by a combination of a reference character L and a numeral.
  • lens groups and so forth are denoted by using independent combinations of reference characters and numerals for each of the examples. Thus, even when the same combinations of reference characters and numerals are used among the examples, this does not mean the same configurations.
  • Table 1 to table 4 are indicated in the following, and among those, the table 1, the table 2, the table 3, and the table 4 are tables which represent respective data of the first example, the second example, the third example, and the fourth example.
  • f denotes a focal length of a whole lens system
  • FNO denotes an F-number
  • ⁇ denotes a half angle of view (whose unit is “°” (degree))
  • Y denotes an image height.
  • a term TL denotes a distance in which Bf (back focal length) is added to a distance on the optical axis from the lens surface on the side of the zoom optical system upon focusing on infinity, the side being closest to the object, to the lens surface on the side closest to the image surface
  • Bf denotes a distance (air equivalent distance) on the optical axis from the lens surface on the side of the zoom optical system upon focusing on infinity, the side being closest to the image surface, to the image surface.
  • a term fM denotes the focal length of the intermediate group
  • fR denotes the focal length of the rear group. Note that those values are indicated for each zooming state of wide angle end (W) and telephoto end (T).
  • a term fF denotes the focal length of the focusing lens group.
  • a term fVR denotes the focal length of the vibration proof group.
  • a term fFRt denotes the combined focal length of the focusing lens group in the telephoto end state and at least one lens group of the rear group.
  • a term f45t denotes the combined focal length of the fourth lens group and the fifth lens group in the telephoto end state.
  • a term PFw denotes the lateral magnification of the focusing lens group in the wide angle end state.
  • a term ⁇ Ft denotes the lateral magnification of the focusing lens group in the telephoto end state.
  • a term ⁇ Rw denotes the lateral magnification of the rear group in the wide angle end state.
  • a term ⁇ Rt denotes the lateral magnification of the rear group in the telephoto end state.
  • a term ⁇ 4 w denotes a lateral magnification of the fourth lens group in the wide angle end state.
  • a term ⁇ 4 t denotes a lateral magnification of the fourth lens group in the telephoto end state.
  • a term ⁇ 5 w denotes the lateral magnification of the fifth lens group in the wide angle end state.
  • a term ⁇ 5 t denotes the lateral magnification of the fifth lens group in the telephoto end state.
  • a surface number denotes order of optical surfaces from the object side along a direction in which a beam of light progresses
  • R denotes a radius of curvature of each of the optical surfaces (a positive value is given to a surface whose center of curvature is positioned on an image side)
  • D denotes a surface distance as a distance on the optical axis from each of the optical surfaces to the next optical surface (or the image surface)
  • nd denotes a refractive index of a material of an optical member with respect to the d-line
  • ⁇ d denotes the Abbe number of the material of the optical member with respect to the d-line as a reference.
  • a radius of curvature of “ ⁇ ” denotes a flat surface or an opening, and (aperture stop S) denotes the aperture stop S.
  • the optical surface is an aspherical surface, “*” sign is given to the surface number, and a paraxial radius of curvature is indicated in a field of the radius of curvature R.
  • a shape of an aspherical surface indicated in [Lens Data] is expressed by the following expression (A).
  • a term X(y) denotes a distance (sag quantity), along an optical axis direction, from a tangential plane at an apex of the aspherical surface to a position on the aspherical surface at a height y
  • R denotes a radius of curvature (paraxial radius of curvature) of a reference spherical surface
  • ⁇ denotes a conic constant
  • Ai denotes an aspherical coefficient at the ith order.
  • a table of [Variable Distance Data] indicates each surface distance at a surface number i for which the surface distance is (Di) in the table of [Lens Data]. Further, the table of [Variable Distance Data] indicates each surface distance upon focusing on infinity and each surface distance upon focusing on a very-short-distance object.
  • a table of [Lens Group Data] indicates a first surface (a surface on a side closest to the object) and a focal length of each of the lens groups.
  • mm is in general used for focal lengths f, radii of curvature R, surface distances D, other lengths, and so forth, which are raised herein, unless otherwise mentioned; however, this is not restrictive because the optical system can obtain equivalent optical performance even when the optical system is proportionally enlarged or proportionally shrunk.
  • FIG. 1 is a diagram illustrating a lens configuration of the zoom optical system according to the first example.
  • the zoom optical system ZL( 1 ) according to the first example includes the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, the third lens group G 3 having positive refractive power, the fourth lens group G 4 having negative refractive power, and the fifth lens group G 5 having negative refractive power, which are aligned in order from the object side along the optical axis.
  • the first lens group G 1 moves to the object side along the optical axis
  • the second lens group G 2 temporarily moves to the image surface side along the optical axis and thereafter moves to the object side
  • the third lens group G 3 , the fourth lens group G 4 , and the fifth lens group G 5 move to the object side along the optical axis, and the intervals between the neighboring lens groups are changed.
  • the aperture stop S is arranged between the second lens group G 2 and the third lens group G 3 , and the aperture stop S moves along the optical axis together with the third lens group G 3 when zooming is performed.
  • a reference character (+) or ( ⁇ ) given to each lens group character indicates refractive power of each lens group, and the same applies to all of the following examples.
  • the first lens group G 1 includes a cemented lens of a negative meniscus lens L 11 having a convex surface facing the object and a biconvex positive lens L 12 , and a positive meniscus lens L 13 having a convex surface facing the object, the above lenses L 11 , L 12 , and L 13 being aligned in order from the object side along the optical axis.
  • the second lens group G 2 includes a negative meniscus lens L 21 having a convex surface facing the object, a biconcave negative lens L 22 , a biconvex positive lens L 23 , and a negative meniscus lens L 24 having a concave surface facing the object, the above lenses L 21 , L 22 , L 23 , and L 24 being aligned in order from the object side along the optical axis.
  • the third lens group G 3 includes a biconvex positive lens L 31 , a biconvex positive lens L 32 , a cemented lens in which a negative meniscus lens L 33 having a convex surface facing the object and a biconvex positive lens L 34 are joined together, and a cemented lens in which a biconvex positive lens L 35 and a negative meniscus lens L 36 having a concave surface facing the object are joined together, the above lenses L 31 , L 32 , L 33 , L 34 , L 35 , and L 36 being aligned in order from the object side along the optical axis.
  • the positive lens L 31 is a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • a surface of the resin layer on the object side is an aspherical surface
  • the positive lens L 31 is a composite-type aspherical surface lens.
  • a surface number 15 indicates a surface of the resin layer on the object side
  • a surface number 16 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 17 indicates a surface of the lens main body on the image surface side.
  • the positive lens L 35 is also a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • a surface of the resin layer on the object side is an aspherical surface
  • the positive lens L 35 is also a composite-type aspherical surface lens.
  • a surface number 23 indicates a surface of the resin layer on the object side
  • a surface number 24 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 25 indicates a surface of the lens main body on the image surface side (a surface which is joined to the negative meniscus lens L 36 ).
  • the fourth lens group G 4 includes a cemented lens in which a biconvex positive lens L 41 and a biconcave negative lens L 42 are joined together in order from the object side.
  • the fifth lens group G 5 includes a negative meniscus lens L 51 having a concave surface facing the object and a positive meniscus lens L 52 having a concave surface facing the object, the above lenses L 51 and L 52 being aligned in order from the object side along the optical axis.
  • the image surface I is arranged on the image side of the fifth lens group G 5 . Further, a parallel flat plate PP is arranged between the fifth lens group G 5 and the image surface I.
  • the third lens group G 3 constitutes the intermediate group GM which, as a whole, has positive refractive power. Furthermore, the positive lens L 35 and the negative meniscus lens L 36 which are arranged on the side of the third lens group G 3 (that is, the intermediate group GM), the side being closest to the image surface, constitute the vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis. Further, the fourth lens group G 4 corresponds to the focusing lens group GF which moves along the optical axis when focusing is performed.
  • the focusing lens group GF (the whole fourth lens group G 4 ) moves to the image surface side along the optical axis.
  • the fifth lens group G 5 constitutes the rear group GR which, as a whole, has negative refractive power.
  • the following table 1 raises values of data of the zoom optical system according to the first example.
  • FIG. 2 A illustrates diagrams of various aberrations of the zoom optical system according to the first example upon focusing on infinity in the wide angle end state.
  • FIG. 2 B illustrates diagrams of various aberrations of the zoom optical system according to the first example upon focusing on infinity in the telephoto end state.
  • FNO denotes the F-number
  • Y denotes the image height.
  • a spherical aberration diagram indicates the value of the F-number which corresponds to the maximum aperture
  • an astigmatism diagram and a distortion diagram respectively indicate the maximum values of the image height
  • a coma aberration diagram indicates the value of each image height.
  • a solid line indicates a sagittal image surface
  • a broken line indicates a meridional image surface. Note that also in diagrams of aberrations in each of the examples, which will be described in the following, similar reference characters to the present example will be used, and descriptions thereof will not be repeated.
  • the zoom optical system according to the first example properly corrects various aberrations from the wide angle end state to the telephoto end state and provides excellent image formation performance.
  • FIG. 3 is a diagram illustrating a lens configuration of a zoom optical system according to the second example.
  • the zoom optical system ZL( 2 ) according to the second example includes the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, the third lens group G 3 having positive refractive power, the fourth lens group G 4 having negative refractive power, and the fifth lens group G 5 having negative refractive power, which are aligned in order from the object side along the optical axis.
  • the first lens group G 1 moves to the object side along the optical axis
  • the second lens group G 2 temporarily moves to the image surface side along the optical axis and thereafter moves to the object side
  • the third lens group G 3 , the fourth lens group G 4 , and the fifth lens group G 5 move to the object side along the optical axis, and the intervals between the neighboring lens groups are changed.
  • the aperture stop S is arranged between the second lens group G 2 and the third lens group G 3 , and the aperture stop S moves along the optical axis together with the third lens group G 3 when zooming is performed.
  • the same reference characters as the case of the first example are given, and detailed descriptions about those lenses will not be made.
  • the third lens group G 3 includes a biconvex positive lens L 31 , a positive meniscus lens L 32 having a convex surface facing the object, a cemented lens in which a negative meniscus lens L 33 having a convex surface facing the object and a biconvex positive lens L 34 are joined together, and a cemented lens in which a biconvex positive lens L 35 and a negative meniscus lens L 36 having a concave surface facing the object are joined together, the above lenses L 31 , L 32 , L 33 , L 34 , L 35 , and L 36 being aligned in order from the object side along the optical axis.
  • the positive lens L 31 is a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • a surface of the resin layer on the object side is an aspherical surface
  • the positive lens L 31 is a composite-type aspherical surface lens.
  • a surface number 15 indicates a surface of the resin layer on the object side
  • a surface number 16 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 17 indicates a surface of the lens main body on the image surface side.
  • the positive lens L 35 is also a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • a surface of the resin layer on the object side is an aspherical surface
  • the positive lens L 35 is also a composite-type aspherical surface lens.
  • a surface number 23 indicates a surface of the resin layer on the object side
  • a surface number 24 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 25 indicates a surface of the lens main body on the image surface side (a surface which is joined to the negative meniscus lens L 36 ).
  • the third lens group G 3 constitutes the intermediate group GM which, as a whole, has positive refractive power. Furthermore, the positive lens L 35 and the negative meniscus lens L 36 which are arranged on the side of the third lens group G 3 (that is, the intermediate group GM), the side being closest to the image surface, constitute the vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis. Further, the fourth lens group G 4 corresponds to the focusing lens group GF which moves along the optical axis when focusing is performed.
  • the focusing lens group GF (the whole fourth lens group G 4 ) moves to the image surface side along the optical axis.
  • the fifth lens group G 5 constitutes the rear group GR which, as a whole, has negative refractive power.
  • the following table 2 raises values of data of the zoom optical system according to the second example.
  • FIG. 4 A illustrates diagrams of various aberrations of the zoom optical system according to the second example upon focusing on infinity in the wide angle end state.
  • FIG. 4 B illustrates diagrams of various aberrations of the zoom optical system according to the second example upon focusing on infinity in the telephoto end state. Based on each of the diagrams of various aberrations, it may be understood that the zoom optical system according to the second example properly corrects various aberrations from the wide angle end state to the telephoto end state and provides excellent image formation performance.
  • FIG. 5 is a diagram illustrating a lens configuration of a zoom optical system according to the third example.
  • the zoom optical system ZL( 3 ) according to the third example includes the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, the third lens group G 3 having positive refractive power, the fourth lens group G 4 having negative refractive power, and the fifth lens group G 5 having negative refractive power, which are aligned in order from the object side along the optical axis.
  • the first lens group G 1 , the second lens group G 2 , the third lens group G 3 , the fourth lens group G 4 , and the fifth lens group G 5 move to the object side along the optical axis, and the intervals between the neighboring lens groups are changed.
  • the aperture stop S is arranged between the second lens group G 2 and the third lens group G 3 , and the aperture stop S moves along the optical axis together with the third lens group G 3 when zooming is performed.
  • the same reference characters as the case of the first example are given, and detailed descriptions about those lenses will not be made.
  • the third lens group G 3 includes a biconvex positive lens L 31 , a cemented lens in which a biconvex positive lens L 32 and a biconcave negative lens L 33 are joined together, a biconvex positive lens L 34 , and a cemented lens in which a biconvex positive lens L 35 and a negative meniscus lens L 36 having a concave surface facing the object are joined together, the above lenses L 31 , L 32 , L 33 , L 34 , L 35 , and L 36 being aligned in order from the object side along the optical axis.
  • the positive lens L 31 is a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • a surface of the resin layer on the object side is an aspherical surface
  • the positive lens L 31 is a composite-type aspherical surface lens.
  • a surface number 15 indicates a surface of the resin layer on the object side
  • a surface number 16 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 17 indicates a surface of the lens main body on the image surface side.
  • the positive lens L 35 is also a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side.
  • the fifth lens group G 5 includes a negative meniscus lens L 51 having a concave surface facing the object and a biconvex positive lens L 52 , the above lenses L 51 and L 52 being aligned in order from the object side along the optical axis.
  • the image surface I is arranged on the image side of the fifth lens group G 5 . Further, the parallel flat plate PP is arranged between the fifth lens group G 5 and the image surface I.
  • the third lens group G 3 constitutes the intermediate group GM which, as a whole, has positive refractive power. Furthermore, the positive lens L 35 and the negative meniscus lens L 36 which are arranged on the side of the third lens group G 3 (that is, the intermediate group GM), the side being closest to the image surface, constitute the vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis. Further, the fourth lens group G 4 corresponds to the focusing lens group GF which moves along the optical axis when focusing is performed.
  • the focusing lens group GF (the whole fourth lens group G 4 ) moves to the image surface side along the optical axis.
  • the fifth lens group G 5 constitutes the rear group GR which, as a whole, has negative refractive power.
  • the following table 3 raises values of data of the zoom optical system according to the third example.
  • FIG. 6 A illustrates diagrams of various aberrations of the zoom optical system according to the third example upon focusing on infinity in the wide angle end state.
  • FIG. 6 B illustrates diagrams of various aberrations of the zoom optical system according to the third example upon focusing on infinity in the telephoto end state. Based on each of the diagrams of various aberrations, it may be understood that the zoom optical system according to the third example properly corrects various aberrations from the wide angle end state to the telephoto end state and provides excellent image formation performance.
  • FIG. 7 is a diagram illustrating a lens configuration of a zoom optical system according to the fourth example.
  • the zoom optical system ZL( 4 ) according to the fourth example includes the first lens group G 1 having positive refractive power, the second lens group G 2 having negative refractive power, the third lens group G 3 having positive refractive power, the fourth lens group G 4 having positive refractive power, the fifth lens group G 5 having negative refractive power, and a sixth lens group G 6 having positive refractive power, which are aligned in order from the object side along the optical axis.
  • the first lens group G 1 , the second lens group G 2 , the third lens group G 3 , the fourth lens group G 4 , the fifth lens group G 5 , and the sixth lens group G 6 move to the object side along the optical axis, and the intervals between the neighboring lens groups are changed.
  • the aperture stop S is arranged between the second lens group G 2 and the third lens group G 3 , and the aperture stop S moves along the optical axis together with the third lens group G 3 when zooming is performed.
  • the first lens group G 1 includes a cemented lens of a negative meniscus lens L 11 having a convex surface facing the object and a positive meniscus lens L 12 having a convex surface facing the object, and a positive meniscus lens L 13 having a convex surface facing the object, the above lenses L 11 , L 12 , and L 13 being aligned in order from the object side along the optical axis.
  • the second lens group G 2 includes a negative meniscus lens L 21 having a convex surface facing the object, a biconcave negative lens L 22 , a biconvex positive lens L 23 , and a biconcave negative lens L 24 , the above lenses L 21 , L 22 , L 23 , and L 24 being aligned in order from the object side along the optical axis.
  • the third lens group G 3 includes a biconvex positive lens L 31 , a positive meniscus lens L 32 having a convex surface facing the object, and a biconcave negative lens L 33 , the above lenses L 31 , L 32 , and L 33 being aligned in order from the object side along the optical axis.
  • the fourth lens group G 4 includes a biconvex positive lens L 41 and a cemented lens in which a negative meniscus lens L 42 having a convex surface facing the object and a biconvex positive lens L 43 are joined together, the above lenses L 41 , L 42 , and L 43 being aligned in order from the object side along the optical axis.
  • the positive lens L 41 is a hybrid type lens which is configured by providing a resin layer on a surface of a glass-formed lens main body on the object side. A surface of the resin layer on the object side is an aspherical surface, and the positive lens L 41 is a composite-type aspherical surface lens.
  • a surface number 21 indicates a surface of the resin layer on the object side
  • a surface number 22 indicates a surface of the resin layer on the image surface side and a surface of the lens main body on the object side (surfaces on which both of those are joined together)
  • a surface number 23 indicates a surface of the lens main body on the image surface side.
  • the fifth lens group G 5 includes a cemented lens in which a biconvex positive lens L 51 and a biconcave negative lens L 52 are joined together in order from the object side.
  • the sixth lens group G 6 includes a negative meniscus lens L 61 having a concave surface facing the object and a biconvex positive lens L 62 , the above lenses L 61 and L 62 being aligned in order from the object side along the optical axis.
  • the image surface I is arranged on the image side of the sixth lens group G 6 . Further, the parallel flat plate PP is arranged between the sixth lens group G 6 and the image surface I.
  • the third lens group G 3 and the fourth lens group G 4 constitute the intermediate group GM which, as a whole, has positive refractive power.
  • the positive lens L 41 of the fourth lens group G 4 constitutes the vibration proof group GVR which is movable to have a displacement component in a direction perpendicular to the optical axis.
  • the fifth lens group G 5 corresponds to the focusing lens group GF which moves along the optical axis when focusing is performed. When focusing is performed from an object at infinity to a short-distance object, the focusing lens group GF (the whole fifth lens group G 5 ) moves to the image surface side along the optical axis.
  • the sixth lens group G 6 constitutes the rear group GR which, as a whole, has positive refractive power.
  • the following table 4 raises values of data of the zoom optical system according to the fourth example.
  • FIG. 8 A illustrates diagrams of various aberrations of the zoom optical system according to the fourth example upon focusing on infinity in the wide angle end state.
  • FIG. 8 B illustrates diagrams of various aberrations of the zoom optical system according to the fourth example upon focusing on infinity in the telephoto end state. Based on each of the diagrams of various aberrations, it may be understood that the zoom optical system according to the fourth example properly corrects various aberrations from the wide angle end state to the telephoto end state and provides excellent image formation performance.
  • Conditional ⁇ Expression ⁇ ( 1 ) 0.01 ⁇ ( - f ⁇ 4 ) / f ⁇ 3 ⁇ 5.
  • Conditional ⁇ Expression ⁇ ( 2 ) 0.01 ⁇ f ⁇ 3 / ( - f ⁇ 5 ) ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 3 ) 0.01 ⁇ f ⁇ 3 / ( - f ⁇ 45 ⁇ t ) ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 4 ) 0.01 ⁇ ⁇ 5 ⁇ t / ⁇ 5 ⁇ w ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 5 ) 0.01 ⁇ Bfw / fw ⁇ 0.95
  • Conditional ⁇ Expression ⁇ ( 6 ) 75. ⁇ v ⁇ 3 ⁇ L
  • Conditional ⁇ Expression ⁇ ( 7 ) 0.01 ⁇ f ⁇ 3 / fVR ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 8 ) 0.3 ⁇ ( - f ⁇ 2 ) / fMt ⁇ 0.8
  • Conditional ⁇ Expression ⁇ ( 9 ) 0.01 ⁇ ( - fF ) / fMt ⁇ 5.
  • Conditional ⁇ Expression ⁇ ( 10 ) 0.01 ⁇ fMt / ⁇ " ⁇ [LeftBracketingBar]” fRt ⁇ " ⁇ [RightBracketingBar]” ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 11 ) 0.01 ⁇ ( - fF ) / ⁇ " ⁇ [LeftBracketingBar]” fRt ⁇ " ⁇ [RightBracketingBar]” ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 12 ) 0.01 ⁇ fMt / ( - fFRt ) ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 13 ) 0.1 ⁇ ⁇ ⁇ Rt / ⁇ ⁇ Rw ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 14 ) 75.
  • Conditional ⁇ Expression ⁇ ( 15 ) 0.01 ⁇ fMt / fVR ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 16 ) 0.01 ⁇ fVR / ( - fF ) ⁇ 2.5
  • Conditional ⁇ Expression ⁇ ( 17 ) 0.01 ⁇ ( - f ⁇ 2 ) / f ⁇ 1 ⁇ 1.
  • Conditional ⁇ Expression ⁇ ( 18 ) 0.01 ⁇ TLt / ft ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 19 ) 0.01 ⁇ ⁇ ⁇ Ft / ⁇ ⁇ Fw ⁇ 2.
  • Conditional ⁇ Expression ⁇ ( 20 ) 75. ⁇ v ⁇ 1 ⁇ L
  • Example Example (1) 0.493 0.318 0.321 — (2) 2.203 2.088 1.928 — (3) 0.224 0.153 0.166 — (4) 0.747 0.672 0.737 — (5) 1.236 1.159 1.166 — (6) 0.557 0.556 0.556 0.583 (7) 82.57 81.61 81.61 — (8) 0.692 0.644 0.643 — (9) 0.660 0.660 0.669 0.678 (10) 2.203 2.088 1.928 1.652 (11) 0.224 0.153 0.166 0.049 (12) 0.493 0.318 0.321 0.081 (13) 0.747 0.672 0.737 0.502 (14) 1.236 1.159 1.166 0.930 (15) 82.57 81.61 81.61 — (16) 0.692 0.644 0.643 0.705 (17) 1.524 1.345 1.239 1.165 (18) 0.170 0.165 0.164 0.168 (19) 1.112 1.111 1.106 1.096 (20) 1.275 1.293
  • Each of the above examples can realize a zoom optical system which provides excellent optical performance while having a small size.
  • zoom optical systems of the embodiments Five-group configurations and a six-group configuration are described as the examples of the zoom optical systems of the embodiments; however, the present application is not limited to those, and zoom optical systems in other group configurations (for example, seven groups, eight groups, nine groups, and so forth) can be configured.
  • a configuration is possible in which a lens or a lens group is added to a side of the zoom optical system of each of the embodiments, the side being closest to the object or closest to the image surface.
  • the intermediate group may include three or more lens groups
  • the rear group may include two or more lens groups.
  • a lens group denotes a portion having at least one lens that is separated by an air distance which changes in zooming.
  • a focusing lens group is not limited to the fourth lens group or the fifth lens group, but the focusing lens group may be formed in which a single or a plurality of lens groups or a partial lens group is moved in the optical axis direction and focusing is thereby performed from an object at infinity to a short-distance object.
  • the focusing lens group is applicable to autofocus and is also suitable for motor driving (using an ultrasonic motor or the like) for autofocus.
  • not only a part of lenses of the third lens group or a part of lenses of the fourth lens group but also a lens group or a partial lens group is moved so as to have a component in a direction perpendicular to the optical axis or is rotationally moved (swung) in an in-plane direction including the optical axis, and a vibration-proof lens group may thereby be provided which corrects an image blur caused due to camera shake.
  • a lens surface may be formed with a spherical surface or a flat surface or may be formed with an aspherical surface.
  • a case where the lens surface is a spherical surface or a flat surface is preferable because processing, assembly, and adjustment of a lens become easy and degradation of optical performance due to errors in processing, assembly, and adjustment can be prevented. Further, the above case is preferable because degradation of representation performance is small even in a case where the image surface is deviated.
  • the aspherical surface may be any of an aspherical surface by a grinding process, a glass-molding aspherical surface in which glass is formed into an aspherical surface shape by a mold, and a composite type aspherical surface in which a resin is formed into an aspherical surface shape on a surface of glass.
  • the lens surface may be formed as a diffraction surface, and a lens may be formed as a gradient-index lens (GRIN lens) or a plastic lens.
  • GRIN lens gradient-index lens
  • the aperture stop be arranged between the second lens group and the third lens group, but without providing a member as the aperture stop, its function may be provided by a frame of a lens instead.
  • each lens surface may be coated with an anti-reflection film which has a high transmittance in a wide wavelength range.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
US18/288,808 2021-06-15 2022-03-04 Zoom optical system, optical apparatus and method for manufacturing the zoom optical system Pending US20250189770A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2021-099589 2021-06-15
JP2021099589 2021-06-15
PCT/JP2022/009426 WO2022264542A1 (ja) 2021-06-15 2022-03-04 変倍光学系、光学機器、および変倍光学系の製造方法

Publications (1)

Publication Number Publication Date
US20250189770A1 true US20250189770A1 (en) 2025-06-12

Family

ID=84526057

Family Applications (1)

Application Number Title Priority Date Filing Date
US18/288,808 Pending US20250189770A1 (en) 2021-06-15 2022-03-04 Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

Country Status (4)

Country Link
US (1) US20250189770A1 (https=)
JP (2) JPWO2022264542A1 (https=)
CN (1) CN117413213A (https=)
WO (1) WO2022264542A1 (https=)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015018124A (ja) * 2013-07-11 2015-01-29 株式会社タムロン ズームレンズ及び撮像装置
CN106461921B (zh) * 2014-04-21 2019-03-26 株式会社尼康 变倍光学系统以及光学设备
JP6340923B2 (ja) * 2014-06-02 2018-06-13 コニカミノルタ株式会社 ズームレンズ，撮像光学装置及びデジタル機器
WO2018092295A1 (ja) * 2016-11-21 2018-05-24 株式会社ニコン 変倍光学系、光学機器、撮像機器および変倍光学系の製造方法
CN109983385B (zh) * 2016-11-21 2021-09-28 株式会社尼康 变倍光学系统以及使用了该变倍光学系统的光学设备和摄像设备
JP7210245B2 (ja) * 2018-11-29 2023-01-23 キヤノン株式会社 ズームレンズ及び撮像装置
JP7216557B2 (ja) * 2019-01-29 2023-02-01 株式会社タムロン ズームレンズ及び撮像装置

Also Published As

Publication number Publication date
JPWO2022264542A1 (https=) 2022-12-22
CN117413213A (zh) 2024-01-16
JP2025147224A (ja) 2025-10-06
WO2022264542A1 (ja) 2022-12-22

Similar Documents

Publication Publication Date Title
US12124018B2 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US8023198B2 (en) Lens system and optical apparatus having this lens system
EP2620796B1 (en) Optical system and imaging apparatus
CN107621690B (zh) 变焦光学系统
US20230266575A1 (en) Variable magnification optical system, optical apparatus, and method for producing variable magnification optical system
US10678034B2 (en) Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system
US20250076622A1 (en) Zoom optical system, imaging device and method for manufacturing the zoom optical system
US7675688B2 (en) Zoom lens system, optical device with zoom lens system, and method of manufacturing zoom lens system
US11714268B2 (en) Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system
US20170075095A1 (en) Zoom lens, imaging device and method for manufacturing the zoom lens
US20250306349A1 (en) Optical system, optical apparatus and method for manufacturing the optical system
US20260072258A1 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US20250085518A1 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US12386159B2 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US20250264701A1 (en) Optical system, optical apparatus and method for manufacturing the optical system
US20250052983A1 (en) Optical system, optical apparatus, and method for manufacturing optical system
US20240201475A1 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
JP6524703B2 (ja) ズームレンズ、光学機器及びズームレンズの製造方法
US12422654B2 (en) Zoom optical system, optical device, and method for manufacturing zoom optical system
US20240053582A1 (en) Optical system, optical apparatus and method for manufacturing the optical system
US20250189770A1 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
US20150185495A1 (en) Variable-magnification optical system, optical device having same variable-magnification optical system, and method for manufacturing variable-magnification optical system
JP2876491B2 (ja) 小型のズームレンズ
US20260086338A1 (en) Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

Legal Events

Date Code Title Description
AS Assignment

Owner name: NIKON CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASHIMA, TOMOYUKI;YOKOI, NORIKAZU;ISHIKAWA, TAKAHIRO;SIGNING DATES FROM 20231017 TO 20231019;REEL/FRAME:065378/0410

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION COUNTED, NOT YET MAILED